“[I]t is not enough to know what we ought to say; we must also say it as we ought … It is, essentially, a matter of the right management of the voice to express the various emotions—of speaking loudly, softly, or between the two; of high, low, or intermediate pitch; of the various rhythms that suit various subjects. These are the three things—volume of sound, modulation of pitch, and rhythm—that a speaker bears in mind.”